Parallel Working of DFIG Based Wind Systems under Unbalanced Grid Conditions

This paper focuses on a parallel working of doubly fed induction generator based wind systems under unbalanced grid conditions. The impact of an asymmetrical voltage sag has been investigated for a doubly fed induction generator based wind system and for different machine locations in the case of a parallel working wind system. Predictive dead-beat control have been applied to the rotor side converters. Then, an adaptive dead-beat predictive control technique is proposed to enhance the behaviour of the wind system. A dynamic modelling of the doubly fed induction generator has been proposed to investigate the dynamic behaviour of the system for these various operating conditions. Different simulation tests have been conducted using the PSIM software and the results are presented and discussed.